Improvement in sewing-machines



R. THOMPSON.

Sewing Maci'nne.

- Patented April 8, 1862..v

UNITED STATES PATENT OFFICE.

osnwnnn THOMPSON, 0F BOSTON, MASSACHUSETTS, ASSIGNOR To HIM;

SELF, J. G. WILDER, AND

znnores' w. HOLDEN, JR

' lMPROVEME NTflN s"aw:ne-inacl-imes.v

Specification forming part of Letters Patent No. 34,926, dated April 8, 1862.

To all when it magi concern:

'Beit known that I, RosnwsLL THOMPSON,

of Boston, in the county of Suifolk and Commonwealth of Massachusetts. have invented certain new and useful Im provements in Look- S'titch Sewing-Machines; and I do hereby declarethat the following is a full, clear, and exact description of the constructioifand op-' eration of the same, reference being bad to the acconipa'nyin g drawings, forming a part of this specification, in which- Figure 1 is a. front view, representing the toe of the revolving- .hook in the act of catching into the loop between the thread and need:'e."- Fig. 2 is a side view, showing the inclination of the revolving hook E to-the axis of the driver. 0." Fig. 3 is a. perspective view of the revolving hook detached, showing the guard, k on the inner edge of the heel of the hook. Fig. 4 is an end view of the revolvingdriver,

and Fig. 5 is a perspective view of the removablebobbin-case. 1

as to revolve with'the hook, and also to .act as a casted for the thread t when the point of the book has entered. the loop formed by the' needle; third, in theiuse of a detachable or re movable bobbin-case,in combination with a revolving-hook, so'that it maybe threaded from the inner side and the thread passed'over the outer side and into a hole in the center of the bottom; and, fourth, in the use of a spring, :0, to confine the bobbin and bobbin-case, as hereinaftet'described. I

To enable others, skilled in the art to make. and use myirnprovements,1 will now proceed to describe their construction and operation.

A is a cast-iron frame, and o is the needle,

which is driven by means of a lever and pitman connected with the driving-shaft .0, Fig. 2, as in many other sewing-machines.

The feeding apparatus, being no part of my invention, is not shown -in the drawings.-

A is a cleat cast on the under side of table a-vertical line, said cleat. being cutout in the middle to give room-for the driver, 8pc.

. A and A. are cleats or studs to furnish suitable bearings for the driver-shaft C. One

a pin. 41, as shown in Figs. 2-a-nd 4.

B B are plates of steel, which are confined tethe inclined face of. the cleat A by means of screws b. In these plates-is a circular hole, which ;is beveled to anedge corresponding Wit'hlthe annular groove 1, Fig. 3, in the re face of said hook is made to'revolve in a plane parallel with-the inclined surfaces of B B, and, as will be seen by inspecting Fig.2, at such an angle with the end of the-idriver 0 that the needle may pass between theihook and driver while in motion, the hook being driven by means of the pins d d d d (two at a time) in the holes m m m m (see Fig. 3) in the flat face of E.

On the inner edge of the heelfof the hook E, and projecting about one-eighth of an inch above the flat face of the same, is a guard, k, as represented in Fig. 3, the object of which is to prevent the thread from being oiled when passing over the heel f of the hook.

9', Fig. 1,and is placed in the round hole a inhook E. On the outer edge of this case is a beveled start, h, the size, shape, and position of which are clearly shown in Fig. 4. This start h to revolve with the hook, whilefat the same time said start h, when in the position reprethread as the point of the hook enters the loop formed by the needie. a

s, Fig. 5, is a hole through which thethread passes out, and u is a groove in which the thread passes down theside of g, to the botgroove 8 as far as 'i and co oted' spring.

vered by a flat piv- A, having its front face inclined slightly from .end of shaft 0 is furnish'edwith' the driver O.' i which is constructedwith four arms, as shown in Fig. 4, each of which arms is provided with volving hook, and by means of which the flat g is a removable'case for holding the bobbin enters a slot in the-face of E,-as shown in Figs. '1 and 2, by meansof which the case is made.

sented in Fig. 1, operates as a cast-0d for the tom of the 'same, into the hole '5 through stud r, the bottom of g having a continuation of a: is flat spring attached to the piece 3 (see 4 Fig. 2) by means of the pivot z, onwhich it (aim be turned to remove the bobbin and case.

The upper end of this spring just comesup to the center of the hole 6 in the central stud, r, of the bobbin-case, and while it beers sufficiently hard to confine'the bobbin and case in the'hook it still allows the cast-ofifthread t0 passunder it at the'prop'er time.

W hat I ciai-mas my inveution,.and desire to secure by'LettersPatent, is-

1. The guard k upon the hook min combination with the driving-pins dysubstan-ti'ai'ly:

as described, and for the objects specified,

2. Constructing the bobbin-case g with a start,,h, upon its outer end, substantially as described, for thepurpose of confining said case soas to revolve'withthe hook, and also .tovact as a east-off for -the.. thread when the 

